For Those Wanting To Run An O/r Exhaust But Fear Emissions

  • Thread starter Deleted member 38176
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Deleted member 38176

For those that are unaware of the procedure involved in emissions testing newer-model vehicles, here is what you need to know....

All inspections testing on vehicles manufactured before 1996, emissions is tested using a traditional sniffer device placed inside the tailpipe. On vehicles manufactured on or after 1996, emissions is tested via a OBDII diagnostic.

Vehicles in which catalytic equipment is altered/removed will trigger an OBDII trouble code (check engine light). This trouble code/SES light can be removed or "cleared" through use of a diagnostic scanner or tuner. However, a problem remains even after all catalytic trouble codes are removed. Once the trouble code is cleared, the PCM will enter a state of "not-ready". In other words, if taken to perform an inspection immediately after resetting the PCM, the emissions testing state will read "not-ready".

Current emissions testing law dictates that on vehicles manufactured on or after 1996 up to 2000, there must not be 2 or more emissions systems reading the "not-ready" status. On vehicles manufactured from 2001 to present, there must not be ANY emissions systems reading the "not-ready" status.

So how do I get my PCM to read "ready"?

In order to clear the P1000 trouble code (system not-ready code), the PCM must complete a Ford designated driving cycle. Once the PCM driving cycle is completed, the P1000 code is cleared and PCM readiness status will now read "ready" and the vehicle will now be ready for emissions testing. As long as all emissions systems read "ready", your catless exhaust vehicle will pass emissions testing.

So how do I satisfy this Ford driving cycle?

Brenspeed created a helpful tutorial and explanation of the Ford drive cycle procedures:

I have had my catalytic converters removed for many years now and stroll into an inspection site worry free. My car has passed emissions trouble-free for the last 4 years by satisfying the drive cycle sequence. I hope this helps those who are interested in running an O/R exhaust but are worried about passing emissions :nice:
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